Abstract: Aiming at the problem of quantitative comprehensive evaluation of machine tool machining performance, the speed and accuracy indexes of 5-axis CNC machine tools were studied, and a two-dimensional comprehensive evaluation method based on actual trajectory was proposed. The combined motion of the rotation axis and the linear axis was controlled by introducing the cylindrical surface and its extended plane. Through the instruction control of the trajectory of the polygon, the position of the motor encoder was extracted and transferred to the extended plane to get the actual trajectory. Taking the difference between the instruction trajectory and the actual trajectory on the expansion plane as error, the high-speed and high-precision performance was evaluated simultaneously in terms of speed and error. Eight test cases were designed by using polygons, and several CNC machine tools were tested. The results indicate that the proposed method can quantitatively and clearly evaluate the high-speed and high-precision performance of CNC machine tools by using the two-dimensional graph of actual speed and maximum error.

Key words: computer numerical control（CNC）machine tool; machining performance; quantitative comprehensive evaluation; machining speed; machining precision